Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a6f01f13d5afc0…

MALICIOUS

PDF

77.7 KB Created: 2021-08-21 02:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 24d719dd0fd91c9c5e7f9a91160f180f SHA-1: b8ed472b4e2fd6986eb20d63b8e0f0b927e51090 SHA-256: a7a6f01f13d5afc008d75a5d9c3185ac17a648651354a31f10b0a4f5c1c20b6b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://garglob.ru/uplcv?utm_term=actividades+de+pronombres+personales+en+ingles+para+imprimir PDF link annotation
    • https://fajanav.com/aym_image/files/kexugumubebuxopitadude.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082b61de2ca6---ruzuzumanulevifavumojaji.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ab92e0e84---80043003218.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/5ba05rp07iuvds2fi89i1eidel/banesub.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/wakelesuxelularenudabo.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/strqvi3ub6hi2t7snce4f9b6lu/pamajuwepusavuxaxejelim.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/f3077f8770822964b8f98703aea32cf3/62755306797.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/5e0i7jn0bvjj1va90ktfcgrfk4/ralakifepopiruwub.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082af0e620c8---sepetuwirabebiga.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/eb8806d5594c4469f6a60edeb850c9b8/berud.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/mumezolivubidopijigexume.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d75d334af6---widejurem.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/52789995521.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854879a1704---27154454714.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/81461834417.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/94041243491.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce54dc8491---77709817722.pdfIn PDF document text
    • https://bselink.com/userfiles/file/xidopobusapet.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/efikm283b07qauid1jrvuovq29/duvezezisagoxogowuf.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/42986313529.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/36250945257.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bc32aae55a435041cf94c007e011bba3/85401995360.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/b496de230ba085074a533fc95290d63c/29552203784.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/54267089208.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FC 11044 bytes
SHA-256: 64d4fd11461db27988d26e5601d8a5d0747ab27697a322fda7428ccf9872f79a
font_01_sfnt_off00010d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D43 19092 bytes
SHA-256: d836f8e985b21f3cdecb6e7f662b1f43e6cd596fc6c6e2bb8fdd7e56adc125c3